Rock-crusher.



No. 857.94ol

PATENTED JUNE 2 5, 1-90'7.

E. A. HOFF.

ROCK GRUSHER.

APPLIOATION FILED JUNE 1a, 1906.

QWWJN I UNITED sTATEs4 PATENT oEErcE.

EDWARD A. HOFF, OF MILWAUKEE, WISCONSIN.

ROCK-CRUSHER.

Specification of Letters Patent.

Patented June 25, 1907.

Applicationliled T une 13, 1906i. Serial No. 321,434.

T all whom it may concern.-

c Be it known that I, EDWARD A. HOFF, residing in Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Rocky operated toggles for producing the gyratory motion of the main shaft and head.

With the above and other objects in view the invention consists in the rock crusher herein claimed, its parts and combinations of parts and allequivalents. l

Referring to the accompanying drawings in which like lcharacters of reference indicate the same parts in the several views Figure 1 is a central sectional view of a' rock crusher constructed in accordance with In these drawings 5 represents the lower' shell and 6 the top shell secured together and provided with the concave 7 andlthehopper '8 as usual, there being spider arms 9 extending across the mouth of the hopper and supporting a suspension bearing 10. A main shaft 11 is pivotally suspended in the suspen- -sion bearing inthe ordinary manner and has secured to it a head 1 2 to cooperate with the concave 7 in crushing the rock during the gyratory motions of the main shaft 11, the rock being fed to these coperating arts vby the ho per 8 and being discharged t erefrom b vt e inclined partition 13 and chute 14. ofthe construction thus far described is well known and constitutes noJ part of this invention, except in combination with the novel operating means for the main shaft to be described.

With rock crushers of this type it has been the practice to produce the gyratory motions of t e main shaft by means of an eccentric turning on the llower end thereof and riding in affixed bearing. This form of operating means imposes a considerable amount of resistance to the driving of the main shaft and is subject to severe wear, making it necessary .to frequently replace the Wearing parts with great inconvenience and loss of time. The present inventionis designed to dispense entirely with the eccentric operating means and provide toggles connecting the main shaft with the lowe'r shell and caused .to swing' the main shaft by having their intermediate connections forced upwardly by means of a rotary cam bearing on casters carried by said intermediate connections of the toggles.

The main shaft 11 at its lower .end is ro- I vided with a pair of flanges 15 between w 'ch are pivotally mounted blocks 16 having togy gle links 17 ivotally connected to their sides.

Each pair o toggle links 17 embraces a yoke 18, being loosely mounted on trunnions 19 at the ends thereof. Toggle links 20 are also loosely mounted on the trunnions 19 of the yokes 18 and those of each pair are pivotally connected to the opposite ends of blocks 21 which are pivotally mounted in brackets 22 clamped to the lower shell by having stems passing therethrough with jam nuts on the outside. The blocks 16 and 21 are so mounted as to permit of a lateral swing of the toggles formed by the toggle links 17 and 20 with their intermediate connections, as shown by the upper and lower toggles in Fi 2. V gEach of the yokes 18 has a caster 23 swiveled therein with a grooved roller 24 to ride on a cam flange 25 which is carried by a beveled gear 26 journaled in the bottom plate 27,' said beveled gear being mounted upon antifriction rollers 28 journaled in the bottom plate and riding on a depending annular flange 29 of the ear. The beveled gear is preferably journa ed in the bottom plate by having a stud 30 projecting downwardly therefrom and turning in a cup-shaped bearing 31 in the bottom plate, there being an oil recess 32 provided in said bearing beneath the stud. The-cam 25 is slightly eccentric to the beveled gear 26 inlorder that it may pass directly beneath the caster rollers 24 in the dierent positions of the toggles, and the caster rollers are xswiveled to enable them to keep their engagement with the cam flange:v

with some suitable source of power, enters the lower shell 5 and has a beveled pinion 34 on its end meshing with the beveled gear 26, and by this means the beveled gear is caused to rotate in itsV bearing 31 and upon its frictionless support formed by the bearing rollers 28.

In operation, the turning of the beveled gear 26 by means of the countershaft causes the cam flange 25 to turn and ride beneath the caster rollers 2.4 of the toggles andcause them to successively straighten out, as shown at the left of Fig. 1, to force the end of the main shaft 11 therefrom. The pitch of the cam is such that two opposite toggles are in their opposite extreme positions at the same time while the other two are in intermediate positions, the position of the imain shaft causing them` to swing away from the straightened toggle as shown in Fig. 2. As thisstraightening and relaxing of the toggles is produced inrotation, the lower end of the main shaft is caused to gyrate and produce the crushing of the rock between the head 12 and the concave 7. Y

With this construction there is very little loss due to friction, as the cam acts as a wedge working between two sets of friction rollers, the bearing rollers 28 and the caster rollers 24, and frictional engaging surface is reduced to a minimum. p

Furthermore, the reaction of the thrust upon the lower end of the main shaft 1 1 is divided between' the heavy walls of the lower shell 11 and the bottom plate 27 instead of being entirely upon the latter, as is usually the case where eccentric means are employed for producing the gyratory motions.

Another feature of advantage of this invention is the facility with which parts may be replaced or re aired when they become worn or broken, it eing only necessary to remove i the bottom plate 27`with the beveled gear 26 and. all of the parts become freely accessible. What I cla-im. as my invention is 1. Means for producing a gyratory motion, comprising a pivotally mounted shaft, a se# ries of toggles connected with the shaft, a stationar support to which the toggles are connecte and means for moving the toggles successively for causing them to exert pressure upon the shaft in dierent directions. 2. Means for producing a gyrato motion, comprising a dpivotally mounted s aft, toggles connecte with the shaft and extending in different directions, a stationary support to which the toggles are connected, and a ro- `tatable ca m bearing on the toggles and causing them to straighten successively to exert pressure' upon the shaft.

3. Means for producing a gyrator motion, comprising a pivotally mounted s aft, togles connected to the shaft and extending in .cglierent directions, a stationary support to which the toggles' are connected, grooved connected, and a rotatable cam bearin rollers carried by the intermediate joints of the tog les, and a rotatable cam bearing on the rol ers for causing the toggles to be straightened successively to exert pressure upon the shaft.

- 4. Means for producing a gyratory motion, comprising a pivotally mounted shaft, a series of togo'les swivelly connected therewith and exten ing in different directions, a stationary `support to whichthe toggles are pivotally connected, rooved caster rollers swivelly mounted at t e intermediate joints of the toggles, a rotatable cam bearing on the caster rollers and adapted to force the toggles to straighten .successively and exert pressure upon the shaft.

5. A rock crusher, comprising a concave, a pivotally mounted main shaft, aA head carried by the main shaft to cooperate with the concave, and means for gyrating the main shaft, comprising a series of toggles connected with the main shaft, a stationary support to whichthe toggles are connected, and means for moving the toggles successively for causing them to exert pressure upon 90,

the shaft in different directions.

6. A rock crusher, comprising a concave, a pivotally mounted inain shaft, a head carried by the main shaft to cooperate with the concave, and means for gyrating the main shaft, comprising toggles connected with tlie shaft and extending in. different directions, a stationary support to which the toggles are on the toggles and causing them to straig ten successively to exert pressure -upon the shaft.

7. A rock crusher, comprising a concave, a pivotally mounted main shaft, a head carried by the main shaft to cooperate with the concave, and means for gyrating'the main shaft, comprisinr toggles connected to the shaft and extending in different directions, a stationary support to which the toggles are connected, grooved rollers carried by the intermediate ljoints of the tog les, and a rota-i table cam bearing on the rol ers for causing the toggles to be straightened successively to exert pressure upon thev shaft.

8. A rock crusher, comprising a concave, a pivotally mounted main shaft, a head carried by the main shaft to coperate with the concave, and means for gyrating thev main shaft, comprising a series of toggles pivotally connected therewithand extending in dierent directions, a stationary support to which the toggles are pivotally connected, grooved caster rollers swivelly mounted at the intermediate joints ofthe toggles, and a rotatable cam bearing on the caster rollersv and adapted to force the toggles to straighten successively and exert pressure upon the shaft.

9. A rock crusher, com rising a concave, a pivotally mounted main s aft, a head carried by the main shaft to cooperate with the con` IOO IIO

l the beveled gear bears, and a counter shaft cave, and means for gyrating the main shaft, comprising a series of toggles` pivotally connected therewith and extending in diHerent directions, a stationary support to which the toggles are pivotally connected, grooved caster rollers swivelly mounted at the intermediate joints of the toggles, a rotatable cam means bearing on the caster rollers and adapted to force the toggles to straighten successively and exert pressure upon the shaft, and friction rollers on which the cam means bears.

10. A rock Crusher, comprising a shell, a concave carried thereby, apivotally mounted main shaft, a head on theV main shaft cooperating with they concave, and means for gyrating thev main shaft, comprising toggles pivotally connected with the main shaft and with the shell, casterrollers carried by the togglesv` at their intermediate connections, a beveled gear journaled in the shell, a cam flange thereon bearing against the caster rollers, friction rollers in the shell upon which entering the shell and having a pinion meshing with the beveled gear. 4

1-1. In a rock crusher, a shell,"a concave carried thereby, la pivotally suspended main shaft, a head carried thereon coperating with the concave, and means for gyrating the main shaft, comprising a pair of annular flanges on the main shaft, blocks pivotally mounted therebetween, pairs of toggle links pivotally connected to the blocks, yokes having trunnions on which the pairs of toggle links are loosely mounted, brackets connect- .ed to the shell, blocks pivotally mounted in the brackets, pairs of toggle links connecting the last mentioned blocks with the -trunnions of the yokes, grooved caster rollers swiveled in the yokes, abottom plate on the shell, a beveled gear journaled therein, a cam flange on the beveled gear bearing on'the caster rollers, bearing rollers journaled in the bottom plate, a flange on the beveled gear riding on the bearing rollers, and a counter shaft entering the shell and having a beveled pinion meshing with the beveled gear for turning the beveled gear and causing the cam flange to force the toggles formed by the sets of toggle links so as to exert pressure upon the main shaft. l

In testimony whereof, I aHiX my signature, in presence of two witnesses.

EDWARD A. HOFF. Witnesses:

ANNAv F. SCHMIDTBAUER, A. L. MoRsELL. 

